Color Gradient in Daq LEDDisplay Background

I would like to recreate the color gradient seen in this dashboard.
Do you know if they used a specific Theme? I was diving into my first CSS editing but I think there are some details I am missing. All my attempts place the gradient behind the LEDDisplay.

Source Image: Welcoming Dash 1.0.0. It’s hard to believe that just two… | by plotly | Plotly | Medium
image
image

my attempt:
image

Also, how do I look up the exact CSS/HTML code I need to modify in my stylesheet.css?
(I’ve seen others post images of such).

app = dash.Dash(name)

app.layout = html.Div(
[
daq.LEDDisplay(
id=‘led_window’,
label=‘Values:’,
value=“1249”,
color=‘yellow’,
backgroundColor=‘black’,
style={‘backgroundColor’: ‘black’,
‘backgroundImage’: ‘linear-gradient(to right, red, yellow)’}
)
], style={‘left’:0, ‘width’:‘15rem’}
) # ~end LEDDisplay

Thanks team!